A small object is enclosed in plastic (n = 1.5). The object appears to be 4.0 cm below the surface. What is the actual distance of the object below the surface?
B. 2.7 cm
C. 4.0 cm
D. 5.5 cm
E. 6.0 cm
E. 6.0 cm
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Explain how sonar is used to locate underwater objects
What will be an ideal response?
A disk (radius = 8.0 cm) that rotates about a fixed axis starts from rest and accelerates at a constant rate to an angular velocity of 4.0 rad/s in 2.0 s. What is the magnitude of the total linear acceleration of a point on the rim of the disk at the instant when the angular velocity of the disk is 1.5 rad/s?
A. 24 cm/s2 B. 16 cm/s2 C. 18 cm/s2 D. 34 cm/s2 E. 44 cm/s2
A composite beam is made up of a 90 mm 5 160 mm wood beam (Ew 5 11 GPa) and a steel bottom cover plate (90 mm 3 8 mm, Es 5 190 GPa). Allowable stresses in wood and steel are 6.5 MPa and 110 MPa, respectively. The allowable bending moment about the z axis of the composite beam is most nearly:
(A) 2.9 kN?m
(B) 3.5 kN?m
(C) 4.3 kN?m
(D) 9.9 kN?m
Momentum: A 0.10-kg ball, traveling horizontally at 25 m/s, strikes a wall and rebounds at 19 m/s. What is the magnitude of the change in the momentum of the ball during the rebound?
A. 1.2 kg ? m/s B. 1.8 kg ? m/s C. 4.4 kg ? m/s D. 5.4 kg ? m/s E. 72 kg ? m/s